CN85102846B - Front-cutoff thermoelectric detector - Google Patents
Front-cutoff thermoelectric detector Download PDFInfo
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- CN85102846B CN85102846B CN85102846A CN85102846A CN85102846B CN 85102846 B CN85102846 B CN 85102846B CN 85102846 A CN85102846 A CN 85102846A CN 85102846 A CN85102846 A CN 85102846A CN 85102846 B CN85102846 B CN 85102846B
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- infrared
- cutoff
- response element
- electrode
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- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
The present invention belongs to photoelectric technology, more specifically to an infrared photodetector using a pyroelectric response element. The present invention is provided with a response element with a front-cutoff spectral characteristic, wherein the response element is a pyroelectric sheet which is provided with an obverse electrode and a back electrode; the obverse electrode can sense near infrared bands and is completely transparent. The present invention is suitable for infrared apparatus of infrared remote switches, thermodetectors, etc., can avoid the influence of sunshine interference, can reduce cost by 50%, and can enhance detectivity by more than one time.
Description
Invention belongs to photoelectric technology, belongs to the infrared photoelectric detector that uses pyroelectric response unit or rather, for infrared alarm, and infrared gears such as infrared remote control switch and infrared thermometer.
A pyroelectric response unit thin slice is housed in the pyroelectric detector before; two Surface Vertical of this thin slice have two pairs of electrodes in spontaneous polarization and on two surfaces; constitute sensitive unit and compensation unit with the pyroelectricity thin slice; sensitive unit is sensitive elemental area over against the electrode (being called front electrode) on incident radiation one side and the lap between backplate; it equates that with the compensation elemental area response element is packaged in the protecting sheathing (referring to Usup4437002).
Common pyroelectric detector all has response to ultraviolet to the radiation of far infrared band, is subject to the interference of sunlight or other visible lights when using, and compensation unit produces noise detector sensitivity is descended.
This detector is used for intrusion alarm, generally must add a preceding cutoff filter before detector when teleswitch and temperature measurer.This optical filter adopts the multilayer films interference method to design, the general more complicated of manufacture craft, and this is very unfavorable for the lowering apparatus cost.
The objective of the invention is to overcome above-mentioned shortcoming, not only can improve performance, and can reduce cost.
Major technique of the present invention is characterised in that the pyroelectric response unit that ends spectral response before, response element is to plate pyroelectricity thin slice (as monocrystalline lithium tantalate) thin slice two Surface Vertical of front electrode and backplate in spontaneous polarization, front electrode is divided into two parts, respectively as sensitive unit and the front electrode that compensates unit.Response element is fixed on the ceramic support, is sealed in the shell that has infrared window.The front electrode of sensitive unit be one by visible light to the complete transparent oxide semiconductor film (as urania) of the initial wavelength of near infrared (as 6 microns).Or adopt at thin metal film (as 50～500 angstrom Ag films) and go up metal electrode of the grating of making, compensating first front electrode and backplate all is that metallic film (as silver) is made, the compensation elemental area is three times of sensitive elemental area.
Accompanying drawing (one) is the front-cutoff thermoelectric detector sectional view of being advised, in order to show its structure better, and with the electrode front elevation, shown in figure (two), 1. shell; 2. infrared window; 3. response element pyroelectricity thin slice; 4. sensitive first front electrode; 5. compensate first front electrode; 6. backplate; 7. ceramic support; 8. contact conductor; 9. sensitive first extraction electrode.
Distance should be greater than 0.5 millimeter between backplate and shell, infrared window (as silicon chip) has one deck anti-reflection film, the present invention is used for the infrared alarm instrument, infrared remote control switch and temperature measurer, not only can eliminate the influence that sunlight disturbs, and because the detectivity height, and omit optical filter and can make cost reduce by 50%, the present invention will be enhanced about more than once than existing pyroelectric detector detectivity.
Claims (2)
1, a kind ofly forms the pyroelectricity thin slice of response element by sensitive unit and compensation unit, And is sealed in the interior front-cutoff thermoelectric detector of shell that has infrared window, it is characterized in that compensating elemental area and be three times of sensitive elemental area.
2, front-cutoff thermoelectric detector according to claim 1 is characterized in that being manufactured with on the conductive film electrode metal electrode 4 of a palisade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85102846A CN85102846B (en) | 1985-04-01 | 1985-04-01 | Front-cutoff thermoelectric detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85102846A CN85102846B (en) | 1985-04-01 | 1985-04-01 | Front-cutoff thermoelectric detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85102846A CN85102846A (en) | 1987-01-31 |
| CN85102846B true CN85102846B (en) | 1988-09-28 |
Family
ID=4792801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85102846A Expired CN85102846B (en) | 1985-04-01 | 1985-04-01 | Front-cutoff thermoelectric detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85102846B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102359821A (en) * | 2011-08-23 | 2012-02-22 | 郑州炜盛电子科技有限公司 | Pyroelectric infrared-sensitive element and pyroelectric infrared detector |
-
1985
- 1985-04-01 CN CN85102846A patent/CN85102846B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN85102846A (en) | 1987-01-31 |
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